硫酸盐侵蚀下混凝土梁的开裂强度分析模型  

Analytical model of strength deterioration of concrete beam under sulfate attack

作　　者：张清清[1] 徐锋[1] 刘伟庆[1] 王曙光[1] 刘鑫[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京211816

出　　处：《混凝土》2017年第1期39-43,共5页Concrete

基　　金：国家973计划项目(2011CB013801);国家自然科学基金(51308285);江苏省自然科学基金(BK20130943);江苏省高校自然科学面上项目(13KJB560004);江苏省高校自然科学研究重大项目(14KJA560001);江苏省产学研联合创新资金--前瞻性联合研究项目(BY2014005-05)

摘　　要：混凝土在硫酸盐侵蚀下将发生化学-力学耦合作用,并导致其力学性能退化和耐久性降低。基于Fick第二定律建立考虑侵蚀损伤演化的硫酸根离子扩散-反应耦合模型,运用Matlab实现该耦合过程的数值求解,得到硫酸盐腐蚀下的细观损伤时变规律,在此基础上建立损伤后混凝土梁式构件开裂强度分析方法,并通过算例进行了性能分析。The chemical-mechanical coupling effect of concrete subjected to sulfate attack would cause the deterioration in mechanical properties and durability of concrete.According to Fiek＇ s second law,adiffusion-reaction model of sulfate ions in concrete based on evolution of erosion-induced damage is proposed and the numerical solution of the coupling process is realized by Matlab program, then it is obtained thatthe time-invariant meso-damage mechanism of concrete under sulfate attack.With the time-invariant meso-damage mechanism,this paper presents an analytical method for the cracking strength of beam concrete specimens.Finally,the mechanical behavior is analyzed through a numerical example.

关 键 词：硫酸盐侵蚀 数值模拟 损伤强度 

分 类 号：TU528.01[建筑科学—建筑技术科学]